Growth of the functional layer and prevention of menstruation during pregnancy are brought about by secretion of
A. relaxin.
B. progesterone.
C. cortisol.
D. human chorionic thyrotropin.
E. human placental lactogen.
B
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During which event are the primary germ layers formed?
A. Implantation B. Cleavage C. Conception D. Organogenesis E. Gastrulation
Which of the following descriptions best matches the term basilar membrane?
A) moves up and down due to currents in the perilymph B) transmits movement of the tympanic membrane to the inner ear C) supports the olfactory organ D) tiny duct necessary for the static sense of equilibrium E) covers over the oval window
The fine muscles within the wings of __________ allow for substantial changes in the wing shape
A) Bats B) Birds C) Insects D) All of the above Fill in the blank with the correct answer.
Pulmonary surfactant decreases surface tension to a greater degree in large alveoli than in small alveoli
Indicate whether the statement is true or false